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RDS has two type of backups; Automated, Snapshot, both of which is stored in AWS-managed S3 Bucket (you can’t see them within your S3).

Because S3 is regionally-resilient, backup is also reslient.

How backup works – Snapshots:
Snapshots aren’t automatic, you run it by script or manually. They function like EBS snapshot. First copy is the full copy of DB, and then incrementer after. Whenver snapshot occurs, there’s a breif moment of interruption (this may impact your app if you’re single AZ).

Automatic backup:
happens once a day. Think of it as automated backup.

Retention period:
amount of day you can recover your data up to; eg: 35 retention period allow you to recover data 35 days ago